Corona

The solar corona is an extremely hot plasma with temperatures exceeding 1,000,000°C, much hotter than the Sun's visible surface at about 6,000°C. It is typically visible from Earth only during a total solar eclipse. The Sun's magnetic field causes the corona to be unevenly distributed, concentrated in some areas and nearly absent in others.

What is the temperature of the plasma in the Sun's corona?

How does the temperature of the Sun's corona compare to that of its visible surface?

When can we usually see the Sun's corona from the ground?

What causes the uneven distribution of the Sun's corona?

In what areas is the Sun's corona concentrated?